Overweight and obesity are considered as a public health problem worldwide and ultimately, this condition encourages millions of people to buy products for losing or controlling weight. In this significant market, it is possible to find a large number and great variety of products sold under the natural origin denomination. In the last decade, it has been found that many of them have been adulterated with synthetic substances to potentiate their effect. A synthetic drug that is used for this purpose is sibutramine, even though it was withdrawn from the worldwide market in 2010 because of its serious side effects. This paper described some significant examples of adulteration of natural products in the world and the analytical methodologies that can be used in determining the adulteration of these goods with sibutramine after reviewing and selecting scientific papers in recent years and access through databases Proquest, Scient Direct, Springer, EBSCO and others of the System of Libraries and Information at the University of Costa Rica. A range of techniques and analytical methods to identify and quantify sibutramine in slimming products was found.